The emergency Room Doctor couldn't see the baby at almost 5 weeks does that mean that i had a miscarriage?

If you had a miscarriage, you will definitely start bleeding heavily certainly after 5 weeks of pregnancy.

ER Doctors are always busy, and will mostly not be focused when the case is not an emergency, in the case you were bleeding and in pain then of course it could have been a miscarriage, best is to try a pregnancy test again, and change hospital.